/Engine/Plugins/Importers/USDImporter/Source/USDClasses/Public/USDClassesModule.h
Updates HashToUpdate with the Object's package's persistent guid, the corresponding file save date and time, and the number of times the package has been dirtied since last being saved. This can be used to track the version of exported assets and levels, to prevent unnecessary re-exports.
static bool HashObjectPackage ( const [UObject](API\Runtime\CoreUObject\UObject\UObject) * Object, [FSHA1](API\Runtime\Core\Misc\FSHA1) & HashToUpdate )